Architecture Building Systems (MEP) 2 — Questions and Answers
Question 1: What is a 'variable air volume' (VAV) HVAC system?
- A system that maintains constant airflow but varies temperature at the central AHU
- A system that varies the quantity of conditioned air delivered to zones to match thermal loads (Correct answer)
- A system that uses variable-speed pumps to regulate chilled water flow
- A system that varies the refrigerant charge to different zones through VRF technology
Correct answer: A system that varies the quantity of conditioned air delivered to zones to match thermal loads
VAV systems modulate the volume of conditioned air delivered to each zone in response to local thermostat demand, saving energy compared to constant-volume systems.
Question 2: What is the purpose of 'grounding' in an electrical system?
- To step down voltage from the utility to usable building levels
- To provide a safe, low-resistance path for fault current to trip protective devices and prevent shock (Correct answer)
- To balance loads across three phases for efficient power delivery
- To filter harmonic distortion from sensitive electronic equipment
Correct answer: To provide a safe, low-resistance path for fault current to trip protective devices and prevent shock
Electrical grounding creates a low-impedance fault current path that causes circuit breakers or fuses to trip quickly, protecting people and equipment from shock and fire.
Question 3: What does a 'building automation system' (BAS) primarily do?
- Automates the entire construction documentation process
- Monitors and controls building mechanical, electrical, and lighting systems from a central platform (Correct answer)
- Manages tenant billing and lease administration for commercial buildings
- Controls automated exterior shading systems only
Correct answer: Monitors and controls building mechanical, electrical, and lighting systems from a central platform
A BAS (also called BMS or EMS) integrates control of HVAC, lighting, fire, and other systems to optimize building performance, energy use, and occupant comfort from a central interface.
Question 4: Which type of fire suppression system is most appropriate in a computer server room where water damage is a concern?
- Wet pipe sprinkler system
- Dry pipe sprinkler system
- Clean agent gaseous suppression system (Correct answer)
- Deluge foam system
Correct answer: Clean agent gaseous suppression system
Clean agent systems discharge electrically non-conductive gas (such as FM-200 or Inergen) that suppresses fire without leaving residue or damaging sensitive electronic equipment.
Question 5: What is the purpose of a 'pressure-reducing valve' (PRV) in a building's water supply system?
- To boost water pressure to upper floors in high-rise buildings
- To reduce incoming street pressure to a safe, usable range within the building (Correct answer)
- To prevent backflow from the building into the public water main
- To regulate hot water temperature at the water heater
Correct answer: To reduce incoming street pressure to a safe, usable range within the building
PRVs reduce potentially excessive street pressure (often 80–150 psi) to the recommended 40–80 psi range suitable for building fixtures and piping.
Question 6: In lighting design, what does 'Color Rendering Index' (CRI) measure?
- The color temperature of a light source in Kelvins
- How accurately a light source reveals the true colors of objects compared to natural daylight (Correct answer)
- The efficiency of a lamp expressed in lumens per watt
- The rated lifespan of an LED luminaire in hours
Correct answer: How accurately a light source reveals the true colors of objects compared to natural daylight
CRI rates a light source on a 0–100 scale based on how faithfully it renders object colors compared to a reference illuminant; higher CRI means more accurate color rendering.
Architecture Building Systems (MEP) 2
What is a 'variable air volume' (VAV) HVAC system?